This binary is the only one to have encounters with all four Galactic spiral arms we consider in this study. According to its spectral type given by [1]} (O9.5 I), the companion star in IGR J18450-0435 should weigh around 29.6 M\(_{\odot }\)  using the tables from [2]}. This puts heavy constraints on the maximum formation age of the binary between 6–9.5 Myr. Only the encounters with the Perseus and Scutum arms at 17 and 22 Myr are valid in this scope. They both produce peculiar velocities close to 60 km.s\(^{-1}\)
